كتاب حقائق عن كوكب الأرض

Earth is a very small planet among the millions of planets, stars and galaxies that fill the universe. Astronomers and physicists are doing a lot of research and research to find new information about the universe and space. In fact, there are many amazing facts that are discovered daily in this matter, It is strange to the earth and the universe that if two metallic pieces are connected in space, they will dissolve together and become one piece immediately. This is called cold docking or docking, and this does not happen on the ground.